| Autor: |
Ahmed Edress, Nader Ahmed, Abu-Hashish, Mohamed Farouk, Darwish, Saudy, Elmaadawy, Khaled Gamal |
| Předmět: |
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| Zdroj: |
Petroleum & Coal; 2024, Vol. 66 Issue 2, p454-467, 14p |
| Abstrakt: |
Abu-Roash-F member (Mb) represents one of the main carbonate source rocks in different oil basins in Egypt that belong to the Upper Cretaceous (Cenomanian) age. Investigated gas chromatograms of five extracted (OM) organic matter samples belonging to the Abu-Roash-F Mb from drilled WON-C-3X borehole, of the Beni-Suef basin, reveal the OM (organic matter) mainly comprising an admixture of the algae and microorganisms of short-chain n-alkanes (average; 37.64%) with sphagnum moss and macrophytes of a mid-chain n-alkanes (average; 24.3%). The investigated Abu-Roash-F Mb in the present study preferred to nominate based on their OM constituents as an algal limestone source rock. The CPI (carbon performance index) of values between 0.88 and 0.92 (average; 0.92) indicates a mature stage of the studied Mb. The average value of the NAR (natural n-alkane) that is close to zero of (0.04) is attributed to petroleum sources. The low values of TAR (terrigenous/aquatic ratio) of average (0.13) and Paq (aquatic macrophyte proxy) of average (0.69) are an indication of the dominance of submerged and floating plants. The n-C27/n-C17 ratio has a value range of 0.31 and 0.34 (average; 0.33) demonstrating the OM affiliation to marine origin. Redox potential was suggested based on Pr/Ph ratios that range from 1.14 to 1.26 (average; 1.22) demonstrating the dysoxic and suboxic of the aqueous depositional medium. The Pr/n-C17 versus Ph/n-C18 diagram illustrates that the kerogen types of the studied samples were a mixture of type II and II/III. It also referred to the deposition that took place within a transitional marine environment of an aquatic coastal setting. A combination of the ACL proxy (average; 27.94) of a moderate value with a low percentage of verylong- chains (average; 3.12%) may suggest the dominance of the grass plants under temperate to cooler paleoclimate synchronizes the deposition environments of the studied Abu-Roash-F Mb. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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